Fixture for riveting machines



April 5, 1927.

W. J. LEHMAN FIXTURE FOR RIVETING MACHINES 2 SheetsSheet 1 Filed April 27, 1925 n .II: M a 0 r v 1 623 796 Aprll 5, 1927. w. J. LEH'MAN i FIX IURE FOR RIVETING MACHINES Filed April 27. 1925 2 Shets-Sheet 2 5Juventoz Patented Apr. 5, i927.

sMrss w 1 1,623,73 PATENT OFFICE,

WALTER J. LEHMAN, OF DEIRGII, MICHIGAN, ASSGN'OR T BRIGGS MANUFACTUR- ING COMIANY, OF 'DETROIT, MIC1GAN, A CORPORATION 013 MICHIGAN.

Application fi1ed April 27, 1925. Serial No.' 26,221.

This invention relates generally to riveting machines and retors more particularly to the anvils and cooperating pistons of tubular riveting machines.

One of the essential objects of the invention to provide a construction of this type in WlllCll the piston is detachably mounted in a suitable support and is normally held in operatire position by means 01: air under ressure.

Another object of the invention is to pro' vide a construction of this type in Which a brisl1iiig serves as a guide for the piston and has a head that constitutes an anvil and that is adapted to receive a projection of the piston.

Another obj ect is to provide a simple and compact construction in Which the piston is readily replaceable.

A turther object is to provide a construction that is strong and durable and can be manufactured at a comparatively low cost.

VJith the above and other objects in vievv, the invention consists of certain novel features ot construction, combination and arrangement ot' parts as Will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawing:

Figure 1 is a fragmentary side elevation of a fixture embodying my invention.

Figure 2 is a tragmentary side elevation of the block.

Figure 3 is a top plan view of the block.

Figure 4 is an end view of the block.

Figure 5 is a top plan view of the bushing.

Figure 6 is a sectional VieW taken on the line 66 oi Figure 5.

Figure 7 is a detail vieW of the piston.

Figure 8 is a side elevation of the nut.

Figure 9 is a bottom plan view of the nut.

Figure 10 is a detail side elevation of the spr1ng. r

Referring now to the drawing, the numeral 1 designates a block for supporting a piston 2 which is adapted to cooperate with the usual driver 3, and an anvil to loe desired, suitable dovvels 8 may be used for accuratclpositioning the block 1 upon the man 7.

Tire piston 2 may be any shape desired and may be tormed of any suitable material. ris shown, the oody portion of the piston is preterably Cylindrical in form and is pro Vided at its upper end with the central cylindrical projection 9 for engagement with a suitable rivet 10.

In order that air under pressure may be nscd to hold the piston 2 in Operative position, the block 1 is preterably provided at its outer end with the vertical bore 11 in which the piston 2 is adapted to reciprocate and for guiding the piston, I preferably provide a tubular bushing 12 that has'a press fit within the bore 11. As shown, this bush. ing 712 receives thebody portion of the pis-' ton and is provided at its upper end with a fianged head 13 having a central aperture 14 for receiving the projection 9 of the piston. This head 13 also p-referably constitutes an anvil and for this purpose is provided with a cup-shaped recess 15 that surrounds the central aperture 14 and is adapted toreceive the lower end portion of the rivet 10. The lower end of the bush ing 12 preferably terminates short of the lower end of the bore 11 and preferably cooperates with a suitable nut 16 to form a passage 17 for air. As shown, this nut 16 threadedly engages the lower walls of the bore 11 in the block and is preferably provided with a central frusto-Co1iical projection 18 which serves as a seat for the body portion of the piston 2 when the latter is in lowered position. Any suitable means such as the straight free end portion 19 of the arcuate shaped spring 20 secured to the base 21 of the recess 22 in the lower face of the block 1 niay ce used to engage the radial slots 23 in the lower face of the nut 16 to prevent the latter from working loose or becoming accidentally disengaged from the block 1.

In order that air under pressure may be conveniently conveyed to the bushing 12 to actuate the piston 2, the block 1 is preferably provided at 0 e side intermediate the ends thereotwitha transversely extending bore 24 constituting an inlet passage, and is provided with the longitudinally extending bore 25 that connects the inlet passage 24 with the passage 17 bctween the bushing 12 and nut 16. Any suitable means (not shown) may be used to convey the air under pressure from a suitable source of supply to the inlet passage 24;. This 1neans may also be provided with a valve foi regulating the supply. A

In the process ot manufacture, a suitable drill (net shown) is used to bore the lateral passage 25. T accornplish this the passage is started at the outer end of the bloek 1, thus a passage 27 is formed between the vertical bore 11 and the outer end of the block; however this passage 27 is closed by a suitable block before the deviee is put into operation.

In use, the desired quantity of air under pressure may be supplied to the passage 17 between the nut 16 and bushing 12, to nor- 1nally hold the projection 9 et the piston in projeeted position. T0 prevent this air fro1n displaeing or otherwise atleeting the rivets 10 used to conneet together the plates 4 and 5 respectively or other work. the bushing 12 is preferably provided adjacent to the head 13, with a radial bore that registers with a suitable outlet passage 31 in the block 1. Thus the air Will be discharged laterally. Should it :be desired to replace the piston 2, the spring 20 is first disengaged from the nut 16, whereupon the latter may be readily removed from the bore 11 to permit the piston 2 to drop from the bushing 12. A new or substitute piston 1nay then be inserted into the bushing 12 and the nut 16 and spring 20 reengaged as betore.

While it is believed that from the foregoing description the nature and advantages of the invention Will be readily apparent, desire to have it understood that I do not li1nit myself to what is herein shown and described, and that sueh changes 1nay loe re sorted .to when desired as tall within the seope et what is clain1ed.

lVhat I daim as my invention is:

1. In a deviee et the class deseribed, tlxe combination with a piston having a projection for engagement with a rivet, of a block having a bore receiving the piston, a passage for supplying air under pressure to the bore to aetuate the piston, and a radial passage. a bushing within said bore surrounding said piston and having a head eonstituting an anvil provided with an aperture tor reeeiving the projection et the piston, said bushing also having a radial passage registering with the radial passage aforesaid for diseharging air laterally so that it will not affectthe rivet.

2. In a device of the class described. the combination with a piston :for engagement with a rivet, of a b]ock having a bore receiving the piston, and a longitudinally extending air supply passage, a bushing surrounding the piston within the bore and ter- 1ninating short et the lower end of said bore, a closure for the lower end of the bore spaeed from the bushing to provide an air passage in communication with the air passage atoresaid.

in a device of the class deseribed, the eombination with a piston for engagement with a rivet. et a block having a bore reeeiving the piston. a bushing surrounding the piston withiu (lie bore terminating short et the lower end et the bore, and a closure for the lower end et the bore spaeed fronr the b!.Slllhg and having a portion constituting a seat for the piston when the latter is in lower1nost position.

4.. In a deviee of the class deseribed, the eombination with a piston foi engagement itl1 a rivet, of a bloek having a bore reeeiving the piston. n1eans associated with said bled; for conveying air under pressure to the piston tor aetuating the saine, a bushing surrounrling the piston within the bore, a elosure t'orthe lower end of the bore spaced i'rom the bushing and having a portion constitu.ting a seat for the piston when the latter is in lowermost position, and a yieidable elenxent seeured to the block having a portion engaging slots provided in said elosure for 1 )reventing the latter fro1n beeoming aceidentally disengaged from the block.

In a deviee et the class deseribed, the 7 eombination with a piston having a projection for engagement with a rivet, of a block having a bore reeeiving the piston, a passage for supplying air under pressure to the bore to aetuate the piston, bushing surrounding the piston within the bore and tern1inating short of the lower end of said bore, a nut threadedly engaging the lower walls of the bore spaced tronx the bushing and having a portion eonstituting a seat for the piston in one position thereof, and a yield able 1nenxher detaclrably secnred to the bloek having 2. portion engageable with the nut to prevent aecidental lisplaeenient thereof.

(S. In a deviee et the class deseribed, the co1nbination with.a piston orengagement ith a rivet, of a bloc]; having a bore reeeiving the piston and having a radial pas sage. a passage for supplying air under pressure to the bore to aetuate the piston, and a l ushing within said bore surreunding said piston and haring a radial passage atoresaid for diseharging air laterally so that it u':ill net affect the rivet.

In testi1nony whereof I aflix 1ny signature.

VALTER J. LEI-IMAN. 

